As others have said, the Actions menu has a shortcut to saved posts, whether you make it part of your bottom bar or Floating Action Button.
Another neat trick is that long-pressing the Action menu will automatically shortcut to whatever the first action listed is. So if you rearrange it so that Saved posts is the first action, your saved posts will always be 1 long-press away!
Maybe I’m crazy entitled, but I feel like if I’m spending a few hundred dollars on this piece of hardware, I shouldn’t have to pay an additional fee to get some of its basic built-in features to work well.